Booster pump impeller construction



ck; 31, 190 -T. R. DINSMORE ET AL. L

BOOSTER PUMP IMPELLER CONSTRUCTION Filed Feb. 10, 1943 Patented Oct. 31, 1944 BOOSTER PUMP IMPELLER CONSTRUCTION More R. Din smore and Henry M. Taylor, i Dayton, Ohio, assignors to Curtis Pump Company, Dayton, Ohio, (corporation of Ohio Application February 10, 1943, Serial No. 475,34 8

7 Claims. (Cl. 103-113) This invention relates to impeller constructions for pumps and more particularly to an impeller construction for a centrifugal type pump which construction increases the swirling of fluid being feeding the fluid to the pumping vanes substantially tangentially thereof.

Other and further. objects of the invention will be apparent to those skilled in the art from the fed to h pumping vanes f h D p 80 as to following "detailed description of the annexed decrease cavitation of the fluid at the pumping vanes. I

In centrifugal type pumps the pumping vanes. tend to shear the fluid being fed thereto and actually create cavitation in the fluid which mal0 terially decreases the efllciency and capacity of the pump. According to this invention the fluid to be pumped is caused-to swirl before it reaches the pumpingvanes so that-the pumping vanes receive the fluid while it is swirling in the same direction as the vanes are being rotated. Because of this preliminary movement imparted to the fluid, the shearing effect of the pumping vanes on the fluid is materially decreased.

sheet of drawing which, by way of preferred example only, illustrates one embodiment ofthe of a centrifugal type booster pump equipped with an impeller construction according to this invention.

Figure 2 is an enlarged top plan view,-with a part in vertical cross section, of the impeller construction in the pump of Figure 1.

Figure 3 is a verticalcross-sectional view, with parts in elevation, taken along the line III-.111

While the invention will hereinafter be specifi-' of Figure 2 cally described as embodied in a centrifugal booster pump adapted to be attached to a gasoline tank, for receiving fluid gasoline directly therefrom, it should be understood that theprinciples of this invention are applicable to many the pump for decreasing cavitation of the fluid at the pumping vanes.

Another object of this invention is to provide a imparts a swirling action to the fluid being fed to 1 Figure 4 is a bottom planview of the swirling vane member included in the impeller construction of this invention.

As shown on the drawings: v

In Figure 1 the reference numeral Ill designates generally an electric motor driven centrifugal type boosterpump including a motor casing I] having a head or cap i2 with a hollow neck portion l3 providing a shaft well, a pump casing portion l4 defining a volute chamber l5 and an annular flange 16 for attachment of the assembly to the bottom of a gasoline tankror the like.

The casing J4 has an open end ll receiving a throat ring l8 defining a central inlet throat i9 simple attachment for impellers of centrifugal 3 to the volute chamber 15. An outlet conduit 20 vide a device adapted to be mounted on or made integral with the impeller of a centrifugal type pumpforswirling the liquid entering'the pump.

A specific object of the invention is to provide an impeller construction for centrifugal type pumps including swirling vanes and pumping vanes, with the swirling vanes arranged to feed 4t portion of theiasmg and through the throat fluid in a direction substantially tangential to the pumping vanes.

A specific object of the invention is to provider an impeller construction for-centrifugal type ipump's including a diskmember with upstanding from points in advance of the pumping vanes for oih h peller. "Since the seal construction communicates with the peripheral portion of the volute chamber ii to receive the pumped fluid therefrom: I

The throat ring 18 can be secured to the c 4 g It by means of screws such as 2|.

The motor in the casing It has a shaft 22 extending through the well provided by the neck portion l3.' The shaft 22 has a reduced end portion or post 23 extending through the central it of the throat ring it. A shoulder N is provided on the shaft at the base of the reduced member so-that the seal member willbe driven The impeller disk 21 spans the inlet throat l3 and communicates at its outer peripherywith the volute chamber It as shown in Figure 1.

The disk 21 has upstanding curved pumping vanes 29 around the periphery thereof. These vanes extend inwardly from the periphery of the disk but terminate at their inner ends substantially flush with the throat opening l3. The vanes 29 thus underlap the throat ring IS. The vanes extend into close proximity with the throat ring l3 and define therebetweenpumping channels 30' for impelling liquid from the throat H! to the volute chamber l5.

The hub 26 of the disk impeller 21 has an up:- wardly extending portion 260 also d sed around the post 23 providing a flared wall 3! in theinlet throat Ill.

The top of this hub portion 26a is milled with a circular milling cutter to provide a key slot or groove 32 as best shown in Figure 3.

.A swirling attachment member 33 composedof a sleeve 34 and four vanes 35 depending from this sleeve is mounted on the post 23 as shown in Figures 1 to 3 with the vanes 35 extending over the curved wall 3| of the hub portion 26a.

As best shown in Figure 4, the bottom of this attachment member 33 is cut with a circular milling cutter to provide'a key slot or groove 33 therein. As shown in Figure 2, the top of the attachment member 33 is similarly cut to provide a key slot or groove 31 therein.

The sleeve portion 34 of the member 33 receives in the bottom groove 33 thereof the le of a key 33 which leg also fits into the groove 32 on the hub portion 234: of the impeller disk 21.

The key member 33 has a ,foot portion seated in a groove 33 on the post 23. In this manner both the impeller disk 21 and the attachment member 33 are keyed to the' post 23 and to each other. In order to provide proper operating clearance for the propeller disk in the pump casing H the groove 33 in the post 23 is elongated and shims mounted on the shoulder 24 will control the level of the assembly.

A propeller 40 composed of a hub portion 4| termediate the vanes, fluid entering the throat l3 will be swirled or rotated by the vanes 35 before it reaches the vanes 23. The swirling mass of fluid will be directed by the vanes 35 and outwardly flared walls 3| of the hub 26a in a radially outward direction so that, when it hits the vanes 23, it is already moving in the direction of liquid in the pumping channels 30. As a result the inner edges of the vanes 23 do not have as much shear eifect on the liquid and less cavitation will occur at the pumping vanes, Because of decreased cavitation, the pumps will have a .higher capacity and will operate much more 'efllciently.

The propeller 40 is useful in creating a lateral flow of liquid adjacent the inlet throat l3 for a J gravity flow from a cgntainer such as a gasoline tank. The swirling attachment member 313 of this invention will make possible increased delivery capacity of the'pump at lower liquid levels above the level of the inlet throat i9 thanwas heretofore possible.-

From the above descriptions it will be understood that this invention provides an impeller construction especially adapted for centrifuge.

type pumps which construction swirls fluid such as liquid being fed to the pump for feeding the pumping vanes.

It will, of course, be understood that various fluid tothe pumping vanes as a moving or swirling mass to decreasecavitation oi the fluid at the details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not for the purpose to limit the patent granted hereon otherand a plurality of vanes 42 has'the hub portion disposed around the upper end of the post 23 on top of the sleeve 34. Tangs 43 can be pressed down from the hub portion 4| into the groove 31 on top of the sleeve 34 for holding the propeller against rotation relative to the sleeve. A nut 44 is threaded onto. the end of the post 23-ior holding the impeller disk 21, the attachment wise than necessitated by the scope of the appended claims. i

We claim as our invention: 1. A pump impeller construction comprising a flat disk, a plurality of elongated spaced pumping vanes on one face of said disk around the outer marginal portion thereof, and a plurality of additional vanes radiating from the central portion of said disk and extending from a level above the pumping vanes to the spaces between the pumping vanes for 'swirlmg liquid being fed to the pumping vanes. 4

2. An impeller construction for a centrifugal type pump having a central inlet and a peripheral outlet'which comprises a plurality of spaced radiating pumping vanes defining pumping channels therebetween for receiving liquid from said .v-rality of additional vanes extending from the i into the inlet throat l3 and flare outwardly over the curved wall 3| of the impeller disk 21 to over lie the base wall of theimpeller disk.

As shown in Figure 2 these vanes 35 are pref erably disposed between the pumping vanes 23 on the disk 21 so as to lie at about the midpoint of every other pumpin channel 33.. As illustrated in Figure 2, eight pumping channels 33 are provided and four swirling vanes 33 are provided. "Since the vanes 33 are driven in the same direction as the vanes 23. andsince the same terminate inwardly oi the vanes 23 at points; in

central inlet to discharge the liquid by centrif ugal. force to said peripheral outlet, and a pluspaces between the pumping vanes into said central inlet for swirling the liquid before it reaches the pumping vanes. a

3. In a centrifugal type pump having a central fluid inlet and a' peripheral pumping chamber, the improvement which comprises an impeller disk spanning said inlet and communicating.

around the periphery thereof with said pumping chamber, upstanding pumping vanes on said disk extending from the periphery of the disk into spaced relation from the center of the disk, and a plurality 0! additional vanes radially inward of said pumping vanes extending into said ments of an impeller disk inwardly from the central inlet for swirling fluid passing therethrough to said pumping vanes.

4. A swirling device for a centrifugal type pump which comprises a sleeve member adapted to be disposed over a driveshaft, and a plurality of vanes extending radiallyaround the sleeve and depending from said sleeve member at spaced intervals therearound.

5. Animpeller construction comprising a disk having an upstanding hub portion, a plurality of upstanding spaced pumping vanes on said disk extending inwardly from the periphery of the disk and terminating in spaced relation from the upstanding hub portion, and a plurality of radial vanes around said hub portion extending from a level above the tops of the pumping vanes to points adjacent the spaces between the pumping vanes.

6. In a -centrifugal type pump having a central inlet throat and a peripheral outlet, the improvethroat spanning the throat opening and communicatingaround the periphery thereof with said outlet, upstanding pumping vanes on said disk defining pumping channels from the throat opening to the outlet, and additional vanes extending from points adjacent the inner ends of said channels into said throat.

7. An impeller construction for centrifugal type pumps comprising a disk member having a plurality of spaced pumping vanes therearound .on one face thereof, and a plurality of upstanding 

